创建个类继承自UILabel
在.h中做如下操作
先在.h文件中设置个枚举：
typedef NS_ENUM(NSInteger, StrikeLineStyle) {
StrikeLineStyleMiddle,//中间划线
StrikeLineStyleBottom//底部划线
};
并在.h文件中设置3个公开的属性，以便被调用：
@property (nonatomic,assign) StrikeLineStyle strkeLineStyle;
@property (nonatomic,assign) BOOL strikeThroughEnabled;// 是否画线
@property (nonatomic,strong) UIColor *strikeThroughColor;// 画线颜色
在.m文件中做一下操作：
- (void)drawTextInRect:(CGRect)rect {
[superdrawTextInRect:rect];
CGSize textSize = [self.text boundingRectWithSize:CGSizeMake([UIScreen mainScreen].bounds.size.width-20,MAXFLOAT)options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:self.font} context:nil].size;
CGFloat strikeWidth = textSize.width;
CGRect lineRect =CGRectZero;
if([self textAlignment] ==NSTextAlignmentRight) {
switch(self.strkeLineStyle) {
case StrikeLineStyleMiddle:
// 画线居中
lineRect =CGRectMake(rect.size.width- strikeWidth, rect.size.height/2, strikeWidth,1);
break;
case StrikeLineStyleBottom:
// 画线居下
lineRect =CGRectMake(rect.size.width- strikeWidth, rect.size.height/2+ textSize.height/2, strikeWidth,1);
break;
default:
break;
}
}else if([self textAlignment] ==NSTextAlignmentCenter){
switch(self.strkeLineStyle) {
case StrikeLineStyleMiddle:
// 画线居中
lineRect =CGRectMake(rect.size.width/2- strikeWidth/2, rect.size.height/2, strikeWidth,1);
break;
case StrikeLineStyleBottom:
// 画线居下
lineRect =CGRectMake(rect.size.width/2- strikeWidth/2, rect.size.height/2+ textSize.height/2, strikeWidth,1);
break;
default:
break;
}
}else{
switch(self.strkeLineStyle) {
case StrikeLineStyleMiddle:
// 画线居中
lineRect =CGRectMake(0, rect.size.height/2, strikeWidth,1);
break;
case StrikeLineStyleBottom:
// 画线居下
lineRect =CGRectMake(0, rect.size.height/2+ textSize.height/2, strikeWidth,1);
break;
default:
break;
}
}
if(self.strikeThroughEnabled){
CGContextRef context =UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [self strikeThroughColor].CGColor);
CGContextFillRect(context, lineRect);
}else{
CGContextRef context =UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [UIColor clearColor].CGColor);
CGContextFillRect(context, lineRect);
}
}
在应用的类中：
BKStrikeLabel*label = [[BKStrikeLabel alloc]init];
label.frame=CGRectMake(100,100,100,21);
label.font= [UIFont systemFontOfSize:13];
label.text=@"￥1234567";
label.strkeLineStyle=StrikeLineStyleMiddle;//中间划线
label.strikeThroughEnabled=YES;
label.strikeThroughColor= [UIColor redColor];
[self.view addSubview:label];
完
